Pechenik, J. A. (2010). A short guide to writing about biology (Seventh edition.). Longman.
Lua i Stíl Chicago (17ú heag.)Pechenik, Jan A. A Short Guide to Writing About Biology. Seventh edition. New York: Longman, 2010.
Lua MLA (9ú heag.)Pechenik, Jan A. A Short Guide to Writing About Biology. Seventh edition. Longman, 2010.
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